Hi,
I had the same problem and it was related to DFM privileges.
If you log in to DFM via a web browser, authenticating as your SnapDrive service account (i.e. the account you configured SnapDrive to use for Protection Manager), do you see your full filer estate and are you able to perform all expected admin actions?
In my case, I had my domain SnapDrive service account registered as a DFM user with GlobalFullControl role, and I could log in but did not then see any storage systems and could not perform any admin tasks. Removing the account from DFM and re-creating it solved the problem for me.
I don;t know why removing/re-adding the account woudl work, but it may be to do with the fact that I performed the initial discovery (with a different account) in DFM after I had added the SnapDrive service account as a DFM user,
Good luck ...
Jon